[Bug 753920] dvdlpcmdec: factor out common code to set output format into new function

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=753920

--- Comment #4 from HoonHee Lee <hoonh83.lee at gmail.com> ---
Created attachment 309944
  --> https://bugzilla.gnome.org/attachment.cgi?id=309944&action=edit
Factor out common code to set output format into new function

Dear All
I updated commit message.
Please review it again.

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